Misthreading device for automatic looms.



C. H. DRAPER & J. NORTHROP.

MISTHREADING DEVICE FOR AUTOMATIC LOOMS.

APPLICATION FILED DEC. I5, 1913- Llfifyfifi Pateni-edlune 13. 1916.

V 3 $HEETSSHEET h a r L C. H. DRAPER & J. NORTHROP. MISTHREADING DEVICE FOR AUTOMATIC LOOMS.

W APPLICATION FILED DEC. l5, l9l3- n L1 @6, 5%, Patenfvd Jum 10, 1916.

3 SHEETSSHEET 2.

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MlTSTHREADING DEVICE FOR AUTOMATIC LOOIVIS.

Specification of Letters latent.

llatenteddnne 13, 1916.

Application filed December 15, 1913. Serial No. 806,784.

To all whom it may concern:

Be it known that we, CLARE H. Dnsrnn and Jonas Non'runor, citizens of the United States, residing-at Hopcdale, in the county of Vflorcester and State of Massachusetts, respectively, have invented certain new and useful Improvements in Misthreading Devices for Automatic Looms; and we do hereby declare the following to be a full clear and exact description of the invention, such as will. enable others skilled in the art to which itappertains to make and use the same.

The present invention relates to an improvement in inisthreading devices for auto matic looms.

ln automatic looms the breaking of the filling when a new filling supply is inserted in the shuttle, called a hopper misthread, causes a'filling absence to bedetected upon the next boxing of the shuttle on the detector side of the loom, and the insertion ot a new filling supply upon the next boxing of the shuttle on the filling supply side of the loom.

Two hopper misthreads in plain weaving will not result in a conspicuous detect in the cloth. and one object of this invention is to produce a construction operating upon three consecutive hopper misthreads to stop the loom.

Sonitiines when a new, filling supply is inserted in the shuttle the thread will fail to enter the shuttle eye, that is, a so-called real inisthread occurs, and on the first stroke of the shuttle across the loorn a filling Will be laid in the shed, and filling till 'presence indicated at the filling Upon the next detector. stroke of the shuttle this thread will break, and on the next stroke thel'eafter a filling absence will be indicated which may be availed of either-Qto cause the insertion of a new filling supply in the shuttle or to stop the loom. Inasmuch as one real inisthread leaves only two filling absences in the cloth, it is not necessary to stop the loom on a single misthread, but upon a second consecutive real rnisthread,

it is desirable to stop the loom because such second consecutive real misthread may indlcatethat the thread eyeof the shuttle is .ing the preferred "form of the invention,

Figure 1 is a section on the line l-1, Fig. 2; Fig. 2 is a plan cta portion of the lefthand end of a 100m embodying the invention; Fig. 3 illustrates the mode of operation of the lnisthreading device upon the occurrence of three hopper misthreads, position 1 showing the position of the parts upon the indication of filling absence, position 2 showing-the position of the parts upon theoccurrence of a hopper misthread incident to filling replenishment brought about by the filling absence indicated in position 1, position 3 showing the position of the parts upon the occurrence of a second hopper misthread, and position 4C showing the position of the parts upon the occurrence of the third hopper inisthread; Fig. 4 illustrates the mode of operation of the device upon the occurrence of two real misthreads, position 1 indicating filling absence, position 2 indicating filling presence after a real misthread incident to filling replenishment, position 3 indicating filling absence following the breaking of the thread v on the return stroke of the shuttle, position 4 indicating filling presence due to the second operation of the filling supply, and position 5 indicating filling absence following the breaking of the thread upon the return stroke after the second filling replenishment; and Fig. 5 illustrates the mode of operation of the device in normal operation of the machine, position 1 indicating filling absence, and the successive positions 2 to 6 inclusive indicating /the steps by which the misthreading device is restored to normal position. i

The left-hand is slotted to receive the shipper and supports the knock-off lever 12.

end of the breast bearnlO lever 11 The manner.

in the usual way 25 the end of 40 filling supply 55 the weft fork 13 is of the pivotally supported upon the detector slide 14 mounted in the detector bracket 15 secured to the breast beam in the usual The weft hammer 16 is oscillated in the usual way, and is adapted to engage the hook 17 of the'fork to cause the detector slide 14 to be pushed forward so as to set the filling supply mechanism in operation through the medium of the rock shaft 20 which extends from side to side across the front of the loom. The detector slide arm 21 mounted on the rock shaft 20 is provided upon its upper end with w 15 a link 22 by which the arm 21 is connected .to the detector slide 14, the front end of the slide being provided with a recess which receives a boss on the rear end of the link 22. 'This mode of connecting the detector 20 with the rock shaft running to the filling supply mechanism affords provision for dis connecting the detector from the filling supply mechanism, when desired, by simply .unhooking the-link 22 from the recess in the detector, which is accomplished by lifting the detector slide 14 so as to permit the link from the recess 23. The front end of the link 22 is hook shaped, as seen in dotted lines in Fig. 1, and hooked over the head 24 of the in 25. The snout 26 on the upper end of the detector arm 21 normally holds the link 22 from displacement. The

I above described arrangement is such that upon the indication of filling absence the -weft hammer, catching the hook 17 on the fork, moves the detector slide 14 forwardly and thereby causes the detector arm 21 to turn the rock shaft 20 so as to cause the mechanism to be set in operation;

The misthreading device consists of the contriv'ance for determining the number of times which the filling supply mechanism shall operate and the conditions under which ,the stopping of the loom shall be, caused. Pivotally mounted on the pin 25 is'a knockoff pawl 30 which is moved forward and back by the movements of the detector arm 21. This pawl bears upon its side a projection or dog 31 which in Fig. 1 is shown as in engagement with the end 32 of the knockoff lever 12.

By reference to Fig. 2 it will be seen that parts have operated to cause the pawl to swing the knock-off lever so as to stop the loom. The free or rear end1of the knockoff pawl 30 rests upon a knock-01f cam 33 which is secured to the side of a ratchet wheel 34. Both are pivoted upon the stud 35 v which is The end of a der the head ratchet 34 and supported in the bracket 15. spring 36 which is secured unof the bolt 18 engages the operates to complete the for- 5 ward movements of the ratchet and topreordinary form, being I 22 to be disengaged that the dog or projection 31 has engaged and operated the the loom.

By reference to Fig. 3', the modus operandi top lever 12 to knock oif of stopping the loom upon the occurrence of three successive hopper misthreads is illustrated, In position 1 the knock-off cam 33 is shown in the position which it normally occupies. At this time it will be observed that the ratchet wheel 34 presents its toothless surface 43 t0 the weft hammer pawl 37, so oscillations of the weft hammer, when the ratchet and its attachedcam occupy the positions illustrated in this figure, have no effect upon the cam and the ratchet because .the pawl 37 does not engage the ratchet wheel 34. But 'now a filling absence hasbeen indicated and the fork 13 occupies detecting position. The weft hammer has en- -gaged the hook 17 on the fork and has moved the slide forwardly far enough so that the-end of the knock-off pawl 30 has dropped into the recess 44in the knock-off cam 33. Upon the backward movement of the detector arm the knock-oif pawl 30 will turn the ratchet B4 and attached cam 33 far enough to bring the next tooth of the ratchet underthe end of the spring which thereupon completes the movement of the cam to substantially the position indicated in posi-' tion 2. The filling absence indicated in position 1 will have done two things, to wit, first it will have set the filling-supply mechanism in operation and upon the back stroke of the detector arm 21 the knock-off cam 33 to gagement of the-knock-oif pawl 30 with the notch 44 thereof. This one-sixth turn given the knocksofl ratchet, which was begun by the pawl and completed by the spring, will bring the tooth45 of theratchet into posi- 115 tlOIL-tO be engaged by the pawl 37 on the weft hammer.

. Now assuming that upon the operation of the filling supply mechaabsence indicated nism caused by the filling from the filling in position 1, theithre'ad supply is broken at the time the filling supply was inserted in the shuttle, that is,that there wasa hopper misthread, absence will be indicated by the fork. as shown in position 2, Fig. 3, and slide will be supply mechanism to insert a new filling supply. At the same time the tooth 45 on the knock-off ratchet will be engaged by the pawl 37 on the weft hammer and the ratchet will be turned by the pawl and thespring 17 it will have caused be turned by the enthen filling the detector I operated to cause the filling through another sixth of revolution, bringing the ratchet to the position indicated in position 3. Assuming a thread at this time, a third operation of the filling supply mechanism will be produced, the tooth 45 of the ratchet will be engaged by the pawl on the weft hammer, another filling supply will be introduced in the shuttle, and the ratchet 34 will be turned through another sixth of a revolution to the position indicated in position 4 of Fig. 3. Assuming a third successive hopper misthread, the fork will indicate filling absence, the filling supply mechanism will be set in operation, the pawl on the weft hammer will engage the tooth 47 on the ratchet wheel 34 and the ratchet will be turned another sixth of a revolution. This will bring the low side of the cam 33 under the end of the knock-off pawl 30, and the projection or dog 31 will engage the arm 32 of the knock-off lever, as shown in position 4 of Fig. 3, and causf? the loom to be stopped by knocking it o Referring to Fig. 4:, the modus operandi of the parts in the event of two real misthreads, will be readily understood. In position l filling absence has been indicated and the ratchet set in motion by engagement of the knock-off pawl with the knockofi cam. In position 2 filling presence is indicated. but the tooth 45 of the ratchet is engaged by the pawl on the weft hammerand the step by step advance of the ratchet and the knock-off cam is continued. In position 3 filling absence is indicated owing to the breaking of the thread on the back stroke of the shuttle and the second operation of the filling supply mechanism is produced. Assuming that another real misthread occurs, the parts occupy the positions indicated in position 4, filling presence being indicated, but the racking of the knockoff cam has been continued, and iffilling absence occurs upon the next detecting stroke, the loom will be stopped owing to the parts occupying the positions indicated in position 5.

In Fig. 5 the successive positions of ratchet and cam are shown, where a filling absence is detected, filling supply provided and normal operation of the loom ensues. In all of the positions after the first the fork is lifted by filling presence and the detector slide is not carried forward by the weft hammer at the time the low part of the cam 33 is under the end of the knock-off pawl 30, as in either of positions 4 or 5, so

' V the loom continues uninterruptcdly in weav ing operation. It is true of course that should a filling breakage occur during positions 4 or 5 there would be a loom stoppage. But inasmuch as filling breakage other than a hopper misthread or a real misthreadis of rare occurrence, the effect of loom stoppage second hopper misbrought about in this way upon the production of cloth will be negligible.

It is to be observed that this construction affords provision for knocking off the loom upon the occurrence of three successive hopper misthreads or two real misthreads, or two hopper misthreads and one real misthread, or on the successive occurrence of one hopper misthread and one real misthread, or one real misthread and one hopper misthread, as Wlll be readily understood from consideration of the foregoing description of the mode of operation of the devlce'. restore itself to a condition of normal operation for the number of picks corresponding to those required for three hopper misthreads or two real misthreads or four successive boxings of the shuttle in the filling supply end of thelay.

The invention is not limited to the illustrated embodiment thereof, but it may be embodied in other forms within the scope of the following claims.

Having thus described a specific embodiment of the invention, what is claimed is 1. An automatic loom, having, in com bination, filling supply operating means, a filling detector, means connected with a reciprocating part of the loom, rotary means set in motion thereby, and means controlled by this latter means for causing loom stoppage on the occurrence of three successive hopper misthreads.

2. fAn automatic loom, having, in combination, filling supply operating means, a filling detector, means connected with a re.- ciprocatihg part motion thereby, and means controlled by this latter means for causing'loom stoppage on the occurrence of two real misthreads.

3. An automatic loom, having, in combination, filling supply operating means, a filling detector, means connected with a reciprocating part of the loom, means set'in motion thereby, and means controlled by this latter means for causing loom stoppage on the occurrence of a hopper misthread and a real misthread.

4c. An automatic loom, having, in combination, filling supply operating means, a filling detector, means connected with a reciprocating part of the loom, means set in motion thereby, and means controlled by this latter means for causing loom stoppage The loom will continue attempting to ,of the loom, means set in i 6. An automatic loom having, in comfilling detector, a ratchet and pawl contrivance started by the operation of the filling supply operating mechanism and thereafter continued in operation. by a reciprocating part of the loom until it has completed a full revolution, it being constructed and arranged to stop the loom if the filling supply mechanism does not within four attempts properly supply filling to the shuttle.

n automatic loom having, in: combination, filling supply operating means, a filling detector, stopping means, a stop delaying device having provision for being started by the operation of the filling sup ply operating means and thereafter actuated by the loom, said device having provision for connecting the filling supply operating means with the stopping means to stop the loom.

8. An automatic loom having, in coni bination, filling supply operating means, a filling detector, connections between the detector and the filling supply operating means, stopping means, connections between the filling supply operating means and the stopping means including a normally inoperative part, means connected with the fil l ing supply operating means for setting such inoperative part in operation, actuating means for such part, said part having provision for controlling the stopping of the loom by the filling supply operating means.

9. An automatic loom having, in combination, filling supply operating means, a filling detector, stopping means, a rotary stop delaying device and means for actuating the stop delaying device, the'device havprovision by virtue of which, when it 1s in motion, it makes-a complete rotation before again regaining an inoperative position.

10. An automatic loom 'having,in combination, filling supply operating means, a filling detector, stopping means, and a pawl and ratchet stop delaying deviceconsisting of a ratchet and toothed cam, the stopping means being controlled by the pawl and ratchet stop delaying device.

11. An automatic loom having, in combination, filling supply operating means, a filling detector, stopping means, and a supply page having a delaying device for delaying the stoppage of the loom, and a spring and pawl device mounted on the weft hammer for actuating the delaying device.

13. An automatic loom having, in combination, filling supply operating means, a

filling detector, and means for causing loom stoppage constructed and arranged to stop the loom when filling is absent on a detecting beat following filling supply replenishment, present on the next detecting beat, and absent on the next detecting beat.

14:. An automatic loom having, in combination, filling supply operatingineans, a filling detector, a ratchet and pawl contrivance started by the operation of the filling perating mechanism constructed and arranged to stop the loom if the filling supply mechanism does not within three attempts properly supply filling to the shuttle.

15. A loom, having in combination, filling detector mechanism, filling supply controlling means adapted to be actuated wh n filling is absent on at detecting beat, and means controlled in its operation by the v filling detector mechanism for causing loom stoppage whenever filling is absent on two successive detecting beats causing replenishment, present on the next detecting beat, and absent on the next detecting beat.

.16. A loom, having in combination, filling detector mechanism, filling supply control- 'ling means adapted to be actuated when filling is absent on a detecting beat, and means controlled in its operation by the filling detector mechanism for causing loom stoppage Whenever filling is absent on three successive detecting beats causing replenishment, present on the next detecting beat, and absent on the next detecting beat. I CLARE H. DRAPER. JONAS NORTHROP, Witnesses: U I i SHELLEY D. VINonn'r, BERTHA I. SNARE. 

